The Remote Signal Activator allows the TORTOISE™ to drive any scale crossing gate or semaphore-style signal that has a vertical actuating wire extending through the layout base. The actuator features positive, screw-adjusted stops at both the vertical and horizontal positions.

Tortoise™ is a trademark of Circuitron. RR-CirKits is an authorized reseller.

See Circuitron's website for manual: 

<http://circuitron.com/index_files/ins/800-8100ins.pdf>